VDB-182956 · CVE-2020-20891 · ID 8282

FFmpeg 4.2.1 libavfilter/vf_gblur.c config_input buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.9	$0-$5k	0.00

Summaryinfo

A vulnerability was found in FFmpeg 4.2.1 and classified as critical. This issue affects the function config_input of the file libavfilter/vf_gblur.c. Executing a manipulation can lead to buffer overflow. This vulnerability is handled as CVE-2020-20891. The attack can be executed remotely. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability has been found in FFmpeg 4.2.1 (Multimedia Processing Software) and classified as critical. This vulnerability affects the function config_input of the file libavfilter/vf_gblur.c. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect availability.

The weakness was released 09/20/2021 as 8282. The advisory is shared for download at trac.ffmpeg.org. This vulnerability was named CVE-2020-20891 since 08/13/2020. There are known technical details, but no exploit is available.

Applying the patch 64a805883d7223c868a683f0030837d859edd2ab is able to eliminate this problem. The bugfix is ready for download at git.ffmpeg.org.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Multimedia Processing Software

Name

FFmpeg

Version

4.2.1

License

open-source

Website

Product: https://ffmpeg.org/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 6.9

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 64a805883d7223c868a683f0030837d859edd2ab

Timelineinfo

08/13/2020 🔍
09/20/2021 +403 days 🔍
09/20/2021 +0 days 🔍
09/29/2021 +9 days 🔍

Sourcesinfo

Product: ffmpeg.org

Advisory: 8282
Status: Confirmed

CVE: CVE-2020-20891 (🔍)
GCVE (CVE): GCVE-0-2020-20891
GCVE (VulDB): GCVE-100-182956

Entryinfo

Created: 09/20/2021 21:23
Updated: 09/29/2021 10:28
Changes: 09/20/2021 21:23 (42), 09/29/2021 10:22 (1), 09/29/2021 10:28 (18)
Complete: 🔍
Cache ID: 216::103